Make message suppression more consistent.

Make the message suppression more consistent, by adding a check
for the message related CMake variables in cmake::IssueMessage,
which allows callers of IssueMessage other than the message
command to behave as expected. Also added a check for
CMAKE_SUPPRESS_DEVELOPER_WARNINGS in the message command to
mirror the deprecated message type behaviour.

Added a 'force' flag to the cmake::IssueMessage method, to
make the message suppression consistent, when setting the
message related CMake variables directly in a CMake file.

Expand message command tests to cover the AUTHOR_WARNING message
type as well.

8 files changed, 102 insertions, 24 deletions

diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 47e1731ac6..1b0a99ae84 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -105,7 +105,8 @@ cmMakefile::~cmMakefile()
 
 //----------------------------------------------------------------------------
 void cmMakefile::IssueMessage(cmake::MessageType t,
-                              std::string const& text) const
+                              std::string const& text,
+                              bool force) const
 {
   // Collect context information.
   if(!this->ExecutionStatusStack.empty())
@@ -114,7 +115,8 @@ void cmMakefile::IssueMessage(cmake::MessageType t,
       {
       this->ExecutionStatusStack.back()->SetNestedError(true);
       }
-    this->GetCMakeInstance()->IssueMessage(t, text, this->GetBacktrace());
+    this->GetCMakeInstance()->IssueMessage(t, text, this->GetBacktrace(),
+                                           force);
     }
   else
     {
@@ -129,7 +131,7 @@ void cmMakefile::IssueMessage(cmake::MessageType t,
       lfc.FilePath = converter.Convert(lfc.FilePath, cmOutputConverter::HOME);
       }
     lfc.Line = 0;
-    this->GetCMakeInstance()->IssueMessage(t, text, lfc);
+    this->GetCMakeInstance()->IssueMessage(t, text, lfc, force);
     }
 }
 
diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index fa1534d957..362ea75fb5 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -709,7 +709,8 @@ public:
   };
 
   void IssueMessage(cmake::MessageType t,
-                    std::string const& text) const;
+                    std::string const& text,
+                    bool force = false) const;
 
   /** Set whether or not to report a CMP0000 violation.  */
   void SetCheckCMP0000(bool b) { this->CheckCMP0000 = b; }
diff --git a/Source/cmMessageCommand.cxx b/Source/cmMessageCommand.cxx
index 2854a82bd3..1c65ef7dd0 100644
--- a/Source/cmMessageCommand.cxx
+++ b/Source/cmMessageCommand.cxx
@@ -43,7 +43,14 @@ bool cmMessageCommand
     }
   else if (*i == "AUTHOR_WARNING")
     {
-    type = cmake::AUTHOR_WARNING;
+    if (this->Makefile->IsOn("CMAKE_SUPPRESS_DEVELOPER_WARNINGS"))
+      {
+      return true;
+      }
+    else
+      {
+      type = cmake::AUTHOR_WARNING;
+      }
     ++i;
     }
   else if (*i == "STATUS")
@@ -73,7 +80,8 @@ bool cmMessageCommand
 
   if (type != cmake::MESSAGE)
     {
-    this->Makefile->IssueMessage(type, message);
+    // we've overriden the message type, above, so force IssueMessage to use it
+    this->Makefile->IssueMessage(type, message, true);
     }
   else
     {
diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index ee1e878660..62476a11a1 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -2485,6 +2485,45 @@ static bool cmakeCheckStampList(const char* stampList)
   return true;
 }
 
+bool cmake::IsMessageTypeVisible(cmake::MessageType t)
+{
+  bool isVisible = true;
+
+  if(t == cmake::DEPRECATION_ERROR)
+    {
+    // if CMAKE_ERROR_DEPRECATED is on, show the message, otherwise suppress it
+    const char* errorDeprecated = this->State->GetCacheEntryValue(
+                                                "CMAKE_ERROR_DEPRECATED");
+    if(cmSystemTools::IsOff(errorDeprecated))
+      {
+      isVisible = false;
+      }
+    }
+  else if (t == cmake::DEPRECATION_WARNING)
+    {
+    // if CMAKE_WARN_DEPRECATED is on, show the message, otherwise suppress it
+    const char* warnDeprecated = this->State->GetInitializedCacheValue(
+                                            "CMAKE_WARN_DEPRECATED");
+    if(cmSystemTools::IsOff(warnDeprecated))
+      {
+      isVisible = false;
+      }
+    }
+  else if (t == cmake::AUTHOR_WARNING)
+    {
+    // if CMAKE_SUPPRESS_DEVELOPER_WARNINGS is on, suppress the message,
+    // otherwise show it
+    const char* suppressDevWarnings = this->State->GetCacheEntryValue(
+                                          "CMAKE_SUPPRESS_DEVELOPER_WARNINGS");
+    if(cmSystemTools::IsOn(suppressDevWarnings))
+      {
+      isVisible = false;
+      }
+    }
+
+  return isVisible;
+}
+
 bool cmake::PrintMessagePreamble(cmake::MessageType t, std::ostream& msg)
 {
   // Construct the message header.
@@ -2508,20 +2547,13 @@ bool cmake::PrintMessagePreamble(cmake::MessageType t, std::ostream& msg)
     {
     msg << "CMake Deprecation Warning";
     }
+  else if (t == cmake::AUTHOR_WARNING)
+    {
+    msg << "CMake Warning (dev)";
+    }
   else
     {
     msg << "CMake Warning";
-    if(t == cmake::AUTHOR_WARNING)
-      {
-      // Allow suppression of these warnings.
-      const char* suppress = this->State->GetCacheEntryValue(
-                                        "CMAKE_SUPPRESS_DEVELOPER_WARNINGS");
-      if(suppress && cmSystemTools::IsOn(suppress))
-        {
-        return false;
-        }
-      msg << " (dev)";
-      }
     }
   return true;
 }
@@ -2579,10 +2611,16 @@ void displayMessage(cmake::MessageType t, std::ostringstream& msg)
 
 //----------------------------------------------------------------------------
 void cmake::IssueMessage(cmake::MessageType t, std::string const& text,
-                         cmListFileBacktrace const& bt)
+                         cmListFileBacktrace const& bt,
+                         bool force)
 {
   cmListFileBacktrace backtrace = bt;
 
+  if (!force && !this->IsMessageTypeVisible(t))
+    {
+    return;
+    }
+
   std::ostringstream msg;
   if (!this->PrintMessagePreamble(t, msg))
     {
@@ -2602,8 +2640,14 @@ void cmake::IssueMessage(cmake::MessageType t, std::string const& text,
 
 //----------------------------------------------------------------------------
 void cmake::IssueMessage(cmake::MessageType t, std::string const& text,
-                         cmListFileContext const& lfc)
+                         cmListFileContext const& lfc,
+                         bool force)
 {
+  if (!force && !this->IsMessageTypeVisible(t))
+    {
+    return;
+    }
+
   std::ostringstream msg;
   if (!this->PrintMessagePreamble(t, msg))
     {
diff --git a/Source/cmake.h b/Source/cmake.h
index c584ad97e3..0630daa841 100644
--- a/Source/cmake.h
+++ b/Source/cmake.h
@@ -311,9 +311,11 @@ class cmake
 
   /** Display a message to the user.  */
   void IssueMessage(cmake::MessageType t, std::string const& text,
-        cmListFileBacktrace const& backtrace = cmListFileBacktrace());
+        cmListFileBacktrace const& backtrace = cmListFileBacktrace(),
+        bool force = false);
   void IssueMessage(cmake::MessageType t, std::string const& text,
-        cmListFileContext const& lfc);
+        cmListFileContext const& lfc,
+        bool force = false);
 
   ///! run the --build option
   int Build(const std::string& dir,
@@ -419,6 +421,12 @@ private:
   // Print a list of valid generators to stderr.
   void PrintGeneratorList();
 
+  /*
+   * Check if messages of this type should be output, based on the state of the
+   * warning and error output CMake variables, in the cache.
+   */
+  bool IsMessageTypeVisible(cmake::MessageType t);
+
   bool PrintMessagePreamble(cmake::MessageType t, std::ostream& msg);
 };
 
diff --git a/Tests/RunCMake/message/nomessage.cmake b/Tests/RunCMake/message/nomessage.cmake
index bcc97be656..582ab4dd79 100644
--- a/Tests/RunCMake/message/nomessage.cmake
+++ b/Tests/RunCMake/message/nomessage.cmake
@@ -1,2 +1,6 @@
 
 message(DEPRECATION "This is not issued")
+
+set(CMAKE_SUPPRESS_DEVELOPER_WARNINGS ON)
+
+message(AUTHOR_WARNING "This is not issued")
diff --git a/Tests/RunCMake/message/warnmessage-stderr.txt b/Tests/RunCMake/message/warnmessage-stderr.txt
index 5c44566372..e60af6e43b 100644
--- a/Tests/RunCMake/message/warnmessage-stderr.txt
+++ b/Tests/RunCMake/message/warnmessage-stderr.txt
@@ -1,4 +1,11 @@
-CMake Deprecation Warning at warnmessage.cmake:4 \(message\):
-  This is a warning
+^CMake Deprecation Warning at warnmessage.cmake:4 \(message\):
+  This is a deprecation warning
 Call Stack \(most recent call first\):
   CMakeLists.txt:3 \(include\)
+
+
+CMake Warning \(dev\) at warnmessage.cmake:8 \(message\):
+  This is a author warning
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.$
diff --git a/Tests/RunCMake/message/warnmessage.cmake b/Tests/RunCMake/message/warnmessage.cmake
index 4c421a1299..53f2a43646 100644
--- a/Tests/RunCMake/message/warnmessage.cmake
+++ b/Tests/RunCMake/message/warnmessage.cmake
@@ -1,4 +1,8 @@
 
 set(CMAKE_WARN_DEPRECATED ON)
 
-message(DEPRECATION "This is a warning")
+message(DEPRECATION "This is a deprecation warning")
+
+set(CMAKE_SUPPRESS_DEVELOPER_WARNINGS OFF)
+
+message(AUTHOR_WARNING "This is a author warning")